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Ferroelectric switching characteristics during continuous polarization reversal were investigated in thin vinylidene fluoride/trifluoroethylene copolymer films by using a train of bipolar on-off electric field pulses. It was found that polarization reversal is accelerated as the pulse width Δt is decreased whereas it is decelerated as Δt is increased. For a given Δt, the switching time ts depends...
In this paper, a modeling of frequency depended dielectric dispersive characteristics of transmission line and its step responses are described. A dielectric dispersive characteristic can be shown by complex relative permittivity of medium. The Debye type and the Lorenz type dispersive characteristics are investigated. The equivalent circuit representations of per unit length parameters of the transmission...
A double-sided wave absorber with specified reflection and transmission coefficients at both sides is proposed. This wave absorber consists of two transparent dielectric layers with three transparent resistance films. Therefore, this wave absorber is transparent and electromagnetic waves are absorbed in both sides. Then it is suitable for the indoor use as electromagnetic wave separator. The design...
Ferroelectric switching characteristics in vinylidene fluoride (VDF)/trifluoroethylene (TrFE) copolymer films have been shown to depend to a variety of factors not only the electric field E and temperature but also film thickness and previous poling conditions. Polarization reversal is believed to progress via nucleation-growth mechanism. However, there remains uncertainty about its microscopic features...
A metal-ferroelectrics-semiconductor (MFS) capacitor with a ferroelectric polymer as a gate dielectric has recently attracted much interest owing to its potential applications in nonvolatile memory. In order to understand switching dynamics, we performed simultaneous measurements of the charge Q and the capacitance C for Au/vinylidene fluoride- trifluoroethylene (VDF-TrFE) /n-Si structure using a...
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